Lacquer composition for cans.



n ED STATES PATENT OFFICE. I

JOHN G. HODGSON, OF MAYWOOD, ILLINOIS, ASSIGNOR 'I'O AME BICAN CANCOMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

1,148,168. No Drawing.

To all whom it may concern Be it known that I, JOHN G. HODGs0N, acitizen of the United States, residing 1n Maywood, in thecounty of Cookand State of Illinois, have invented a new and useful Improvement inLacquer Composition for Cans, of which the following is a specificaaprotective coating composition or lacquer capable of being readily,conveniently and quickly dried and hardened after application to theinterior surface of the can, and which, when so dried and hardened, willform a perfect, smooth, effective, firmly adherent, hard, dry, solid,tasteless, harmless, protective coating on the interior surface of thecans, which will be insoluble and unaffected by acids or juices offruits, vegetables, and other food products, and which will not beinjuriously alfected by the heat of the cooking or processing operationsto which the cans are subjected after being filled, nor by the heat ofthe soldering operation by which the can cap which closes the fillingopening is secured or soldered in place after the can has been filled.

In the compounding and manufacture of my improved lacquer, I take twopounds of what is called wood pitch, that is to say, the pitchyresidueremaining after the destructive distillation of Wood, and one pound ofeither 'gas pitch, that is to say, the residue left in gas retorts, orin lieu thereof, one pound of the residue of the distillation ofpetroleum, known as parolite pitch. These two kinds of pitch I place ina suitable vessel and cook, at a temperature of 375 to 400- degreesFahrenheit, for three hours or long enough to drive off the volatilenon-drying portions, so that when the material is subsequently cooled,it will be hard and easily broken into lumps, and if put in a mortar maybe readily reduced to a powder. I dov not usually powder the combinedpitch, but prefer to break it into small lumps. I take of this cookedmaterial broken up, about six Specification of Letters Patent.

LACQUER COMPOSITION FOR CANS.

Patented July 27, 1915.

Application filed August 10, 1911. Serial No. 643,265.

ounces by weight and mix it with one gallon of benzol or equivalentsolvent and allow the mixture to stand until the pitch is thoroughlydissolved or out, when the lacquer is ready for use. It generally takesthree or four days to form a perfect soluti0 n of the pitch in thebenzol. The foregoing composition when applied as a'lacquer totinvessels, and allowed to harden, is tasteless, odorless, substantiallyinocuous and will stand the action of boiling Water, and also the'hotacids, etc., which are often encountered in the canning of fruits andvegetables, catsups, pickles, cider, etc.

. Sometimes I add boiled linseed oil in proportion of three or four xpercent. by Weight of the weight of the solid material, and I find thatthis addition of the oil does not materially affect the drying qualitiesof the lacquer.

Pitches of the kind above named, as the same are purchased in the openmarket, are not always alike. A Some contain more oils or oilyingredients than others, and it is my purpose in cooking the pitchestogether to drive these oily ingredients out until the remainder is in asuitable condition to use for the lacquer, and I determine this bydissolving a small quantity of the cooked pitch in the benzol solvent,applying it to a tin surface, and putting this lacquered surface inboiling water. If the boiling water dissolves the lacquer, the pitchshould be' cooked more, until the boiling, water will no longer dissolveit. A fairly good test also is to cookthe pitches until so hard thatthey can be readily pulverized in a mortar. Owing to the varyingconditions of the material, I; do not wish to limit myself to the exactlength of time in cooking the pitches.

I claim I 1. A protective lacquer or coating composition suitable forcoating the interior walls of sheet metal cans and adapted to withstanda processing heat which includes, in

its

tions thereof'removed; nd a suitable solvent, substantially asspecified.

3. A protective lacquer or coating composition suitable for coating theinterior walls of food containers and adapted to withstand .a processingheat and comprising a pitch having the volatile non-drying. portlonsthereof removed and dissolved in benzol,

sition suitable for coatin substantially as specified. 4. A protectivelacquer or coating composition suitable for coatin the interior walls offood containersand a apted to withstand a processing heat and comprisinga mixture of Wood pitch and gas pitch having the volatile non-dryingportions thereof removed and dissolved in benzol, substantially asspecified.

5. A protective lacquer or coating composition suitable for coatin theinterior walls of food containers and a apted to withstand a processingheat and comprising a pitch having the volatile non-drying portionsthereof removed and a suitable solvent in the proportion approximatingsix ounces of the pitch and one gallon of the solvent, sub- 'stantiallyas speci ed.

6. A protective lacquer or coating compdthe interior walls of foodcontainers and a apted to withstand a processing heatand comprising, incombination: a mixture of pitches having the volatile non-dryingportions thereof removed,

f one of which is wood pitch; and a "suitable sition suitable for coatinsolvent, substantially as specified.

7. A protective lacquer or coating compothe interior walls of foodcontainers and a apted to withstand a processinglheat and comprising-amixture of wood pitch and gas pitch having the volatile non-dryingportions thereof removed in the. proportion approximating two parts byweight of the wood pitch to one part by weight of the gas pitchanddissolved in a suitable solvent,'substantially as specified.

8. .A protective lacquer or coating composition suitable for coating theinterior walls of foodcontainers and adapted to withstand a processingheat and comprisin a mixture of pitches, one of which is woo pitchhaving the volatile non-drying portions thereof removed, dissolved inbenzol in the proportion approximating six ounces of the cooked mixtureto one gallon of the benzol, substan tially as specified.

- 9. A protective lacquer or coating composition suitable for coatingthe interior walls of food containers and adapted to withstand aprocessing heat and comprising a mixture a processing heat andcomprising, in combination: a cooked pitch having the volatilenon-drying portions thereof removed; benfioll'; and linseed oil,substantially as specie walls of food containers and adapted towithstand a processing'heat and comprising a mixture of pitches, oneof-which is wood 'pitch, havin the volatile non-drying portions thereoremoved, linseed oil and benzol,the parts being in the proportionapproximating six. ounces of the cooked pitch, 'one gallon of benzol,linseed oil three per cent. by weight of the cooked pitch.

JOHN G. HQDGSO N. Witnesses: l K 5 PEARL ABRAMs, ESTHER ABRAMs.

A protective lacquer or coating composition suitable for coating theinterior-

